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kensville
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Join Date: Apr 2011
Posts: 3

Mill DC Motor Problem

04/11/2011 1:45 PM

A forward-reverse DC motor was working perfectly in our mill;How do i correct the following:(1)sometimes when forward push button is pressed,it moves forward & at times it behaves otherwise(reverse),(2)It also takes high current
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sidhu16
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India - Member - New Member Engineering Fields - Electrical Engineering - New Member Technical Fields - Technical Writing - New Member

Join Date: Feb 2010
Location: India
Posts: 92
Good Answers: 2
#1

Re: Mill DC Motor Problem

04/11/2011 11:17 PM

You may use contactors which have mechanical interlocks also. When forward action is on then reverse contactor cann't be picked up and vice-versa. You may also check the control ckt. thouroughly to check any leakage or contactor sluggishness etc.
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kensville
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Join Date: Apr 2011
Posts: 3
#2

Re: Mill DC Motor Problem

04/12/2011 10:47 AM

The motor actually works perfectly at certain times & behave abnormally at some other times,taking high currents
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loyd
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Join Date: Mar 2011
Posts: 48
#3
In reply to #2

Re: Mill DC Motor Problem

04/13/2011 1:21 PM

whats the motor capacity (its hp and volt rating) is u make forward ,reverse frequently? whats the actual process ur doing?
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34point5
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Join Date: May 2010
Location: in optimism
Posts: 4050
Good Answers: 130
#4

Re: Mill DC Motor Problem

04/14/2011 12:16 AM

Generally it means the switching has dirty, sticky, or eroded contacts, so some are not 'making' while others might not be 'breaking'.

It can happen quite early in a switch systems life, if 'reversing' is used as a brake in a switch system designed about 'normal deceleration'.

Reversing will produce currents far in excess of 'normal deceleration' contact design amps.

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34point5 (1); kensville (1); loyd (1); sidhu16 (1)

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